2015, 34(1) 25-33 DOI:     ISSN: 1004-5589 CN: 22-1111/P
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Keywords
 Taerqi
Baiyingaolao Formation
geochemistry
source of magma
acid volcanic rocks
Da
Hinggan mountains
Authors
WANG Xiong
CHEN Yue-Jun
LI Yong
LI Sen-Lin
WANG Chang-Bing
LIU Yong-Jun
ZHU Huai-Liang
WU Guo-Xue
PubMed
Article by Wang, X.
Article by Chen, Y. J.
Article by Li, Y.
Article by Li, S. L.
Article by Wang, C. B.
Article by Liu, Y. J.
Article by Shu, H. L.
Article by Wu, G. X.

Geochemical characteristics and geological implication of volcanic rocks in Early Cretaceous Baiyingaolao Formation from Taerqi area�� middle- north part of Da Hinggan mountains

WANG Xiong, CHEN Yue-Jun, LI Yong, LI Sen-Lin, WANG Chang-Bing, LIU Yong-Jun, ZHU Huai-Liang, WU Guo-Xue

1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. ��esearch Center of Paleontology �� Stratigraphy��Jilin University��Changchun 130026��China; 3. No. 209 Geological Team of Yunnan Nuclear Industry��Kunming 650032��China; 4. Liaoning ��esearch Institute of Geology and Mineral ��esources��Shenyang 110032��China 5. Tianjin Geothermal Exploration and Development- Designing Institute��Tianjin 300250��China

Abstract��

The volcanic rocks in Baiyingaolao Formation of Taerqi area are composed of rhyolite��lithic crystal tuff and rhyolitic lithic crystal tuffolava�� The geochemical study suggests that the rocks are rich in Al 2 O 3 (Al 2 O 3 = 13. 37% ��15. 79%) and alkalis (Na 2 O + K 2 O =6. 10% ��8. 56%)��while poor in magnesium and calcium�� All samples are characterized by relatively high total ��EE contents�� H��EE and L��EE have distinct fractionation �� (La/ Yb) N =3. 72 ��17. 9��while the H��EE has an obvious sag�� The trace element are characterized evidently by en- richment of LILEs (K����b��Ba and L��EE)��strong depletion of Sr and HFSEs (Nb��Ta��Ti)�� Combining with the previous studies��we suggest that the volcanic rocks in Baiyingaolao Formation from Taerqi area were originated from partial melting of mafic lower crustal materials�� and the rocks have the characteristics of A- type rhyolite�� impl- ying they were formed in an extensional setting��which may be caused by the closure of Mongol- - Okhotsk Ocean��

Keywords��  Taerqi   Baiyingaolao Formation   geochemistry   source of magma   acid volcanic rocks   Da
Hinggan mountains  
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